<%
'######################################################################
'## easp.md5.asp
'## -------------------------------------------------------------------
'## Feature     :   MD5 Encryption
'## Version     :   1.0
'## Author      :   Coldstone(coldstone[at]qq.com)
'## Update Date :   2010/01/26 16:08:30
'## Description :   Encrypt strings with MD5 in EasyASP
'##
'######################################################################
Private Const BITS_TO_A_BYTE = 8
Private Const BYTES_TO_A_WORD = 4
Private Const BITS_TO_A_WORD = 32
Class EasyASP_md5
	Private m_lOnBits(30)
	Private m_l2Power(30)
	 
	Private Function LShift(lValue, iShiftBits)
		If iShiftBits = 0 Then
			LShift = lValue
			Exit Function
		ElseIf iShiftBits = 31 Then
			If lValue And 1 Then
				LShift = &H80000000
			Else
				LShift = 0
			End If
			Exit Function
		ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
			Err.Raise 6
		End If
	
		If (lValue And m_l2Power(31 - iShiftBits)) Then
			LShift = ((lValue And m_lOnBits(31 - (iShiftBits + 1))) * m_l2Power(iShiftBits)) Or &H80000000
		Else
			LShift = ((lValue And m_lOnBits(31 - iShiftBits)) * m_l2Power(iShiftBits))
		End If
	End Function
	
	Private Function RShift(lValue, iShiftBits)
		If iShiftBits = 0 Then
			RShift = lValue
			Exit Function
		ElseIf iShiftBits = 31 Then
			If lValue And &H80000000 Then
				RShift = 1
			Else
				RShift = 0
			End If
			Exit Function
		ElseIf iShiftBits < 0 Or iShiftBits > 31 Then
			Err.Raise 6
		End If
		
		RShift = (lValue And &H7FFFFFFE) \ m_l2Power(iShiftBits)
	
		If (lValue And &H80000000) Then
			RShift = (RShift Or (&H40000000 \ m_l2Power(iShiftBits - 1)))
		End If
	End Function
	
	Private Function RotateLeft(lValue, iShiftBits)
		RotateLeft = LShift(lValue, iShiftBits) Or RShift(lValue, (32 - iShiftBits))
	End Function
	
	Private Function AddUnsigned(lX, lY)
		Dim lX4
		Dim lY4
		Dim lX8
		Dim lY8
		Dim lResult
	 
		lX8 = lX And &H80000000
		lY8 = lY And &H80000000
		lX4 = lX And &H40000000
		lY4 = lY And &H40000000
	 
		lResult = (lX And &H3FFFFFFF) + (lY And &H3FFFFFFF)
	 
		If lX4 And lY4 Then
			lResult = lResult Xor &H80000000 Xor lX8 Xor lY8
		ElseIf lX4 Or lY4 Then
			If lResult And &H40000000 Then
				lResult = lResult Xor &HC0000000 Xor lX8 Xor lY8
			Else
				lResult = lResult Xor &H40000000 Xor lX8 Xor lY8
			End If
		Else
			lResult = lResult Xor lX8 Xor lY8
		End If
	 
		AddUnsigned = lResult
	End Function
	
	Private Function md5_F(x, y, z)
		md5_F = (x And y) Or ((Not x) And z)
	End Function
	
	Private Function md5_G(x, y, z)
		md5_G = (x And z) Or (y And (Not z))
	End Function
	
	Private Function md5_H(x, y, z)
		md5_H = (x Xor y Xor z)
	End Function
	
	Private Function md5_I(x, y, z)
		md5_I = (y Xor (x Or (Not z)))
	End Function
	
	Private Sub md5_FF(a, b, c, d, x, s, ac)
		a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_F(b, c, d), x), ac))
		a = RotateLeft(a, s)
		a = AddUnsigned(a, b)
	End Sub
	
	Private Sub md5_GG(a, b, c, d, x, s, ac)
		a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_G(b, c, d), x), ac))
		a = RotateLeft(a, s)
		a = AddUnsigned(a, b)
	End Sub
	
	Private Sub md5_HH(a, b, c, d, x, s, ac)
		a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_H(b, c, d), x), ac))
		a = RotateLeft(a, s)
		a = AddUnsigned(a, b)
	End Sub
	
	Private Sub md5_II(a, b, c, d, x, s, ac)
		a = AddUnsigned(a, AddUnsigned(AddUnsigned(md5_I(b, c, d), x), ac))
		a = RotateLeft(a, s)
		a = AddUnsigned(a, b)
	End Sub
	
	Private Function ConvertToWordArray(sMessage)
		Dim lMessageLength
		Dim lNumberOfWords
		Dim lWordArray()
		Dim lBytePosition
		Dim lByteCount
		Dim lWordCount
		
		Const MODULUS_BITS = 512
		Const CONGRUENT_BITS = 448
		
		lMessageLength = Len(sMessage)
		
		lNumberOfWords = (((lMessageLength + ((MODULUS_BITS - CONGRUENT_BITS) \ BITS_TO_A_BYTE)) \ (MODULUS_BITS \ BITS_TO_A_BYTE)) + 1) * (MODULUS_BITS \ BITS_TO_A_WORD)
		ReDim lWordArray(lNumberOfWords - 1)
		
		lBytePosition = 0
		lByteCount = 0
		Do Until lByteCount >= lMessageLength
			lWordCount = lByteCount \ BYTES_TO_A_WORD
			lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
			lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(Asc(Mid(sMessage, lByteCount + 1, 1)), lBytePosition)
			lByteCount = lByteCount + 1
		Loop
	
		lWordCount = lByteCount \ BYTES_TO_A_WORD
		lBytePosition = (lByteCount Mod BYTES_TO_A_WORD) * BITS_TO_A_BYTE
	
		lWordArray(lWordCount) = lWordArray(lWordCount) Or LShift(&H80, lBytePosition)
	
		lWordArray(lNumberOfWords - 2) = LShift(lMessageLength, 3)
		lWordArray(lNumberOfWords - 1) = RShift(lMessageLength, 29)
		
		ConvertToWordArray = lWordArray
	End Function
	
	Private Function WordToHex(lValue)
		Dim lByte
		Dim lCount
		For lCount = 0 To 3
			lByte = RShift(lValue, lCount * BITS_TO_A_BYTE) And m_lOnBits(BITS_TO_A_BYTE - 1)
			WordToHex = WordToHex & Right("0" & Hex(lByte), 2)
		Next
	End Function
	
	Private Function MD5(sMessage, bit)
		m_lOnBits(0) = CLng(1)
		m_lOnBits(1) = CLng(3)
		m_lOnBits(2) = CLng(7)
		m_lOnBits(3) = CLng(15)
		m_lOnBits(4) = CLng(31)
		m_lOnBits(5) = CLng(63)
		m_lOnBits(6) = CLng(127)
		m_lOnBits(7) = CLng(255)
		m_lOnBits(8) = CLng(511)
		m_lOnBits(9) = CLng(1023)
		m_lOnBits(10) = CLng(2047)
		m_lOnBits(11) = CLng(4095)
		m_lOnBits(12) = CLng(8191)
		m_lOnBits(13) = CLng(16383)
		m_lOnBits(14) = CLng(32767)
		m_lOnBits(15) = CLng(65535)
		m_lOnBits(16) = CLng(131071)
		m_lOnBits(17) = CLng(262143)
		m_lOnBits(18) = CLng(524287)
		m_lOnBits(19) = CLng(1048575)
		m_lOnBits(20) = CLng(2097151)
		m_lOnBits(21) = CLng(4194303)
		m_lOnBits(22) = CLng(8388607)
		m_lOnBits(23) = CLng(16777215)
		m_lOnBits(24) = CLng(33554431)
		m_lOnBits(25) = CLng(67108863)
		m_lOnBits(26) = CLng(134217727)
		m_lOnBits(27) = CLng(268435455)
		m_lOnBits(28) = CLng(536870911)
		m_lOnBits(29) = CLng(1073741823)
		m_lOnBits(30) = CLng(2147483647)
		
		m_l2Power(0) = CLng(1)
		m_l2Power(1) = CLng(2)
		m_l2Power(2) = CLng(4)
		m_l2Power(3) = CLng(8)
		m_l2Power(4) = CLng(16)
		m_l2Power(5) = CLng(32)
		m_l2Power(6) = CLng(64)
		m_l2Power(7) = CLng(128)
		m_l2Power(8) = CLng(256)
		m_l2Power(9) = CLng(512)
		m_l2Power(10) = CLng(1024)
		m_l2Power(11) = CLng(2048)
		m_l2Power(12) = CLng(4096)
		m_l2Power(13) = CLng(8192)
		m_l2Power(14) = CLng(16384)
		m_l2Power(15) = CLng(32768)
		m_l2Power(16) = CLng(65536)
		m_l2Power(17) = CLng(131072)
		m_l2Power(18) = CLng(262144)
		m_l2Power(19) = CLng(524288)
		m_l2Power(20) = CLng(1048576)
		m_l2Power(21) = CLng(2097152)
		m_l2Power(22) = CLng(4194304)
		m_l2Power(23) = CLng(8388608)
		m_l2Power(24) = CLng(16777216)
		m_l2Power(25) = CLng(33554432)
		m_l2Power(26) = CLng(67108864)
		m_l2Power(27) = CLng(134217728)
		m_l2Power(28) = CLng(268435456)
		m_l2Power(29) = CLng(536870912)
		m_l2Power(30) = CLng(1073741824)
	
		Dim x
		Dim k
		Dim AA
		Dim BB
		Dim CC
		Dim DD
		Dim a
		Dim b
		Dim c
		Dim d
		
		Const S11 = 7
		Const S12 = 12
		Const S13 = 17
		Const S14 = 22
		Const S21 = 5
		Const S22 = 9
		Const S23 = 14
		Const S24 = 20
		Const S31 = 4
		Const S32 = 11
		Const S33 = 16
		Const S34 = 23
		Const S41 = 6
		Const S42 = 10
		Const S43 = 15
		Const S44 = 21
	
		x = ConvertToWordArray(sMessage)
		
		a = &H67452301
		b = &HEFCDAB89
		c = &H98BADCFE
		d = &H10325476
	
		For k = 0 To UBound(x) Step 16
			AA = a
			BB = b
			CC = c
			DD = d
		
			md5_FF a, b, c, d, x(k + 0), S11, &HD76AA478
			md5_FF d, a, b, c, x(k + 1), S12, &HE8C7B756
			md5_FF c, d, a, b, x(k + 2), S13, &H242070DB
			md5_FF b, c, d, a, x(k + 3), S14, &HC1BDCEEE
			md5_FF a, b, c, d, x(k + 4), S11, &HF57C0FAF
			md5_FF d, a, b, c, x(k + 5), S12, &H4787C62A
			md5_FF c, d, a, b, x(k + 6), S13, &HA8304613
			md5_FF b, c, d, a, x(k + 7), S14, &HFD469501
			md5_FF a, b, c, d, x(k + 8), S11, &H698098D8
			md5_FF d, a, b, c, x(k + 9), S12, &H8B44F7AF
			md5_FF c, d, a, b, x(k + 10), S13, &HFFFF5BB1
			md5_FF b, c, d, a, x(k + 11), S14, &H895CD7BE
			md5_FF a, b, c, d, x(k + 12), S11, &H6B901122
			md5_FF d, a, b, c, x(k + 13), S12, &HFD987193
			md5_FF c, d, a, b, x(k + 14), S13, &HA679438E
			md5_FF b, c, d, a, x(k + 15), S14, &H49B40821
		
			md5_GG a, b, c, d, x(k + 1), S21, &HF61E2562
			md5_GG d, a, b, c, x(k + 6), S22, &HC040B340
			md5_GG c, d, a, b, x(k + 11), S23, &H265E5A51
			md5_GG b, c, d, a, x(k + 0), S24, &HE9B6C7AA
			md5_GG a, b, c, d, x(k + 5), S21, &HD62F105D
			md5_GG d, a, b, c, x(k + 10), S22, &H2441453
			md5_GG c, d, a, b, x(k + 15), S23, &HD8A1E681
			md5_GG b, c, d, a, x(k + 4), S24, &HE7D3FBC8
			md5_GG a, b, c, d, x(k + 9), S21, &H21E1CDE6
			md5_GG d, a, b, c, x(k + 14), S22, &HC33707D6
			md5_GG c, d, a, b, x(k + 3), S23, &HF4D50D87
			md5_GG b, c, d, a, x(k + 8), S24, &H455A14ED
			md5_GG a, b, c, d, x(k + 13), S21, &HA9E3E905
			md5_GG d, a, b, c, x(k + 2), S22, &HFCEFA3F8
			md5_GG c, d, a, b, x(k + 7), S23, &H676F02D9
			md5_GG b, c, d, a, x(k + 12), S24, &H8D2A4C8A
				
			md5_HH a, b, c, d, x(k + 5), S31, &HFFFA3942
			md5_HH d, a, b, c, x(k + 8), S32, &H8771F681
			md5_HH c, d, a, b, x(k + 11), S33, &H6D9D6122
			md5_HH b, c, d, a, x(k + 14), S34, &HFDE5380C
			md5_HH a, b, c, d, x(k + 1), S31, &HA4BEEA44
			md5_HH d, a, b, c, x(k + 4), S32, &H4BDECFA9
			md5_HH c, d, a, b, x(k + 7), S33, &HF6BB4B60
			md5_HH b, c, d, a, x(k + 10), S34, &HBEBFBC70
			md5_HH a, b, c, d, x(k + 13), S31, &H289B7EC6
			md5_HH d, a, b, c, x(k + 0), S32, &HEAA127FA
			md5_HH c, d, a, b, x(k + 3), S33, &HD4EF3085
			md5_HH b, c, d, a, x(k + 6), S34, &H4881D05
			md5_HH a, b, c, d, x(k + 9), S31, &HD9D4D039
			md5_HH d, a, b, c, x(k + 12), S32, &HE6DB99E5
			md5_HH c, d, a, b, x(k + 15), S33, &H1FA27CF8
			md5_HH b, c, d, a, x(k + 2), S34, &HC4AC5665
		
			md5_II a, b, c, d, x(k + 0), S41, &HF4292244
			md5_II d, a, b, c, x(k + 7), S42, &H432AFF97
			md5_II c, d, a, b, x(k + 14), S43, &HAB9423A7
			md5_II b, c, d, a, x(k + 5), S44, &HFC93A039
			md5_II a, b, c, d, x(k + 12), S41, &H655B59C3
			md5_II d, a, b, c, x(k + 3), S42, &H8F0CCC92
			md5_II c, d, a, b, x(k + 10), S43, &HFFEFF47D
			md5_II b, c, d, a, x(k + 1), S44, &H85845DD1
			md5_II a, b, c, d, x(k + 8), S41, &H6FA87E4F
			md5_II d, a, b, c, x(k + 15), S42, &HFE2CE6E0
			md5_II c, d, a, b, x(k + 6), S43, &HA3014314
			md5_II b, c, d, a, x(k + 13), S44, &H4E0811A1
			md5_II a, b, c, d, x(k + 4), S41, &HF7537E82
			md5_II d, a, b, c, x(k + 11), S42, &HBD3AF235
			md5_II c, d, a, b, x(k + 2), S43, &H2AD7D2BB
			md5_II b, c, d, a, x(k + 9), S44, &HEB86D391
		
			a = AddUnsigned(a, AA)
			b = AddUnsigned(b, BB)
			c = AddUnsigned(c, CC)
			d = AddUnsigned(d, DD)
		Next
		If bit = 16 Then
			MD5 = LCase(WordToHex(b) & WordToHex(c))
		ElseIf bit = 0 Then
  		MD5 = LCase(WordToHex(c) & WordToHex(a) & WordToHex(d) & WordToHex(b))
		Else
			MD5 = LCase(WordToHex(a) & WordToHex(b) & WordToHex(c) & WordToHex(d))
		End If
	End Function
	Public Default Function To32(ByVal s)
		To32 = MD5(s,32)
	End Function
	Public Function To16(ByVal s)
		To16 = MD5(s,16)
	End Function
  Public Function Strong(ByVal s)
    Strong = MD5(s,0)
  End Function
End Class
%>